* {
    margin: 0;
    padding: 0;
}

body {
    font-family: 微软雅黑;
    width: 100%;

    background-color: #757575;
    -webkit-transition: background-color 400ms ease-in-out;
    -o-transition: background-color 400ms ease-in-out;
    -moz-transition: background-color 400ms ease-in-out;
    transition: background-color 400ms ease-in-out;
}

#background {
    position: absolute;
    height: 100%;
    width: 100%;
}

#output {
    opacity: 0.3;
    width: 100%;
    height: 100%;
    -webkit-transition: all 400ms ease-in-out;
    -o-transition: all 400ms ease-in-out;
    -moz-transition: all 400ms ease-in-out;
    transition: all 400ms ease-in-out;
}

#header {
    position: absolute;
    left: 0;
    top: 20px;
    width: 100%;
    min-width: 1240px;
    z-index: 99;
}

#logo {
    text-align: center;
}

#logo img {
    width: 180px;
}

#nav {
    margin-top: 5px;
}

#nav > ul {
    background-color: rgba(0, 0, 0, 0);
    text-align: center;
}

#nav a {
    color: #ffffff !important;
    font-size: 16px;
    font-weight: normal;
    line-height: 28px;
}

.layui-nav-bar {
    background-color: #ffffff !important;
}

.layui-this:after {
    background-color: #8e8e8e !important;
}

#content {
    top: 90px;
    left: 0;
    width: 1240px;
    margin: auto;
}

#content::-webkit-scrollbar {
    display: none
}

#wecan {
    width: 100%;
    text-align: center;
}

#wecan > img {
    width: 700px;
    height: 440px;
}

#product {
    margin: 20px;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
}

.product-column {
    display: flex;
    flex-direction: column;
    width: 390px;
}

.product-item {
    position: relative;
    width: 100%;
    height: auto;
    margin-bottom: 10px;
}

.product-item > img {
    width: 100%;
    display: block;
}

.product-item > video {
    width: 100%;
    display: block;
}

.poster {
    position: absolute;
    top: 0;
    width: 100%;
    animation: opacityTo1 1s;
    animation-fill-mode: forwards;
}

.poster:hover {
    position: absolute;
    top: 0;
    width: 100%;
    animation: opacityTo0 1s;
    animation-fill-mode: forwards;
}

@keyframes opacityTo0 {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes opacityTo1 {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}